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Method for preparing modified melamine-formaldehyde resins

A technology of melamine and formaldehyde resin, applied in the field of resin, can solve the problems of high brittleness and poor flexibility of resin, and achieve the effects of improving yield, increasing resin strength and optimizing reaction route

Active Publication Date: 2014-11-19
SHENGQUAN HEALTANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the problems existing in the existing preparation method, the purpose of this invention is to provide a kind of preparation method of modified melamine formaldehyde resin, the resin obtained by this method has good heat resistance, high strength, strong cohesiveness, The characteristics of good toughness solve the problem of high brittleness and poor flexibility of resins in the past

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Mix 100 parts by weight of melamine and 150 parts of formaldehyde, adjust the pH to 8.5 with a 30% NaOH aqueous solution by mass fraction, raise the temperature to 70°C, keep the temperature for 2 hours, and cool down to obtain a mixture A;

[0022] b. Adjust the pH of 15 parts by weight of cardanol to 5.2 with 35% ammonia water and hydrochloric acid, add 150 parts of formaldehyde solution, add 1.5 parts of concentrated sulfuric acid and mix, raise the temperature to 70°C, keep the temperature at 1, and measure the phenol content to 0.89%. mixture B;

[0023] c. After mixing the mixtures A and B, keep the temperature at 70°C for 1 hour to obtain the modified melamine formaldehyde resin.

Embodiment 2

[0025] a. Mix 100 parts by weight of melamine and 160 parts of formaldehyde, adjust the pH to 9 with a 40% NaOH aqueous solution by mass fraction, raise the temperature to 75°C, keep the temperature for 3 hours, and cool down to obtain a mixture A;

[0026] b. Adjust the pH of 20 parts by weight of cardanol to 6.2 with 45% ammonia water and hydrochloric acid, add 160 parts of formaldehyde solution, add 3 parts of sulfur trioxide and mix, heat up to 80 ° C, keep the temperature for 2 hours, and measure the phenol content of 0.79% get mixture B;

[0027] c. After mixing the mixtures A and B, keep the temperature at 85°C for 2 hours to obtain the modified melamine formaldehyde resin.

Embodiment 3

[0029] a. Mix 100 parts by weight of melamine and 170 parts of formaldehyde, adjust the pH to 9.5 with a 50% NaOH aqueous solution by mass fraction, raise the temperature to 80°C, keep the temperature for 4 hours, and cool down to obtain a mixture A;

[0030] b. Adjust the pH of 25 parts by weight of cardanol to 6.5 with 30% ammonia water and hydrochloric acid, add 170 parts of formaldehyde solution, add 7 parts of chlorosulfonic acid and mix, heat up to 85 ° C, keep the temperature for 4 hours, and measure the phenol content of 0.64% get mixture B;

[0031] c. After mixing the mixtures A and B, keep the temperature at 80°C for 3 hours to obtain the modified melamine formaldehyde resin.

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Abstract

The invention relates to the field of resins, in particular to a method for preparing modified melamine-formaldehyde resins. The method comprises the following steps: mixing melamine with formaldehyde, raising the temperature to 65-95 DEG C, keeping the temperature for 2-6 hours and reducing the temperature to obtain a mixture A; regulating the PH value of cardanol to 5-6, adding formaldehyde and sulfonating agents to be mixed, raising the temperature to 70-90 DEG C, keeping the temperature for 1-3 hours and measuring the content of phenols to be less than 1% to obtain a mixture B; and mixing the mixture A and the mixture B and then keeping the temperature of 70-90 DEG C for 1-5 hours, thus obtaining the modified melamine-formaldehyde resins. The method has the beneficial effects that the resin strength is increased; the amount of the added phenols is reduced; the problem of reaction rate reduction caused by steric hindrance of molecules in reaction is reduced; the defects of poor water solubility and poor dispersibility are overcome; the reaction yield is increased; the reaction time is shortened; and the reaction route is optimized.

Description

technical field [0001] The invention relates to the field of resins, in particular to a method for preparing modified melamine-formaldehyde resins. Background technique [0002] Melamine formaldehyde resin is a widely used thermosetting amino resin obtained by polycondensation of melamine through methylation reaction. The curing of melamine formaldehyde resin is realized by cross-linking each other through methylene or dimethylene ether bonds. The two ends of the methyl group are connected with triazine rings with large steric hindrance, and multiple methylene groups and triazine rings are cross-linked with each other, so the resin is hard and hard to bend after curing, and has almost no toughness. The cured resin absorbs moisture from the air to cause volume changes, resulting in internal stress, which eventually causes resin cracks. [0003] Chinese Patent Publication No. CN1095385 "Preparation Method of Highly Sulfonated Melamine Formaldehyde Resin" provides a high d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G14/12C08G14/10
Inventor 唐地源刘顶王恩华
Owner SHENGQUAN HEALTANG
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